The 12C/13C ratio in jupiter from the Voyager infrared investigation |
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| Authors: | R Courtin D Gautier A Marten V Kunde |
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| Institution: | 1. Laboratoire de Physique Stellaire et Planétaire, B.P. 10-91370 Verrières-le-Buisson, France;2. Laboratoire d''Astronomie Infrarouge, Observatoire de Meudon-92195 Meudon Principal Cedex, France;3. NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA |
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| Abstract: | The 12C/13C ratio in Jupiter has been derived from the analysis of the ν4 band of CH4 in the spectra recorded by the Voyager 1 IRIS experiment. It is found to be 160?55+40, i.e., 1.8?0.6+0.4 times the terrestrial value. Instrumental noise as well as systematic sources of error were taken into account for the estimate of the uncertainty. No plausible theory predicts such a difference between the values of the 12C/13C ratio in the inner solar system and in Jupiter. However, values of this ratio in the solar neighborhood 4.5 by ago inferred—through the use of models of chemical evolution of the Galaxy —from recent interstellar medium measurements are compatible with the present determination in Jupiter. The Jovian value, rather than the terrestrial one, could then be representative of the ratio in the primitive solar nebula. |
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